├── .gitignore ├── README.md ├── setup.py ├── tests ├── test_prefixtree.py └── test_wordcut.py └── wordcut ├── LICENSE ├── LICENSE-DICT ├── __init__.py ├── bigthai.txt ├── dict.txt └── example.py /.gitignore: -------------------------------------------------------------------------------- 1 | # Byte-compiled / optimized / DLL files 2 | __pycache__/ 3 | *.py[cod] 4 | 5 | # C extensions 6 | *.so 7 | 8 | # Distribution / packaging 9 | .Python 10 | env/ 11 | build/ 12 | develop-eggs/ 13 | dist/ 14 | downloads/ 15 | eggs/ 16 | .eggs/ 17 | lib/ 18 | lib64/ 19 | parts/ 20 | sdist/ 21 | var/ 22 | *.egg-info/ 23 | .installed.cfg 24 | *.egg 25 | 26 | # PyInstaller 27 | # Usually these files are written by a python script from a template 28 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 29 | *.manifest 30 | *.spec 31 | 32 | # Installer logs 33 | pip-log.txt 34 | pip-delete-this-directory.txt 35 | 36 | # Unit test / coverage reports 37 | htmlcov/ 38 | .tox/ 39 | .coverage 40 | .coverage.* 41 | .cache 42 | nosetests.xml 43 | coverage.xml 44 | *,cover 45 | 46 | # Translations 47 | *.mo 48 | *.pot 49 | 50 | # Django stuff: 51 | *.log 52 | 53 | # Sphinx documentation 54 | docs/_build/ 55 | 56 | # PyBuilder 57 | target/ 58 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | wordcutpy 2 | ========= 3 | wordcutpy is a simple Thai word breaker written in Python 3+ 4 | 5 | Installation 6 | ------------ 7 | 8 | ```` 9 | pip install wordcutpy 10 | ```` 11 | 12 | 13 | Example 14 | ------- 15 | 16 | ### Conventional verison 17 | 18 | ````python 19 | #! -*- coding: UTF8 -*- 20 | from wordcut import Wordcut 21 | if __name__ == '__main__': 22 | with open('bigthai.txt', encoding="UTF-8") as dict_file: 23 | word_list = list(set([w.rstrip() for w in dict_file.readlines()])) 24 | wordcut = Wordcut(word_list) 25 | print(wordcut.tokenize("กากา cat หมา")) 26 | ```` 27 | 28 | 29 | ### Simplified version 30 | 31 | 32 | ````python 33 | #! -*- coding: UTF8 -*- 34 | from wordcut import Wordcut 35 | wordcut = Wordcut.bigthai() 36 | print(wordcut.tokenize("กากา cat หมา")) 37 | ```` 38 | 39 | Test 40 | ---- 41 | 42 | ### Run tests 43 | 44 | ````shell 45 | python -m unittest discover -s tests 46 | ```` 47 | 48 | -------------------------------------------------------------------------------- /setup.py: -------------------------------------------------------------------------------- 1 | from setuptools import setup 2 | 3 | setup(name='wordcutpy', 4 | version='0.1.2', 5 | description='Thai word tokenizer written in Python', 6 | url='https://github.com/veer66/wordcutpy.git', 7 | author='Vee Satayamas', 8 | author_email='vsatayamas@gmail.com', 9 | license='LGPLv3', 10 | package_data={'': ['LICENSE', 'LICENSE-DICT', 'README.md', 'bigthai.txt', 'dict.txt']}, 11 | include_package_data=True, 12 | packages=['wordcut'], 13 | zip_safe=False) 14 | -------------------------------------------------------------------------------- /tests/test_prefixtree.py: -------------------------------------------------------------------------------- 1 | import unittest 2 | import sys 3 | import os 4 | sys.path.append(os.path.abspath('..')) 5 | from wordcut import PrefixTree 6 | 7 | class TestPrefixTree(unittest.TestCase): 8 | def test_building_prefix_tree_with_none(self): 9 | pt = PrefixTree(None) 10 | self.assertEqual(pt.lookup(0,0,"A"), None) 11 | 12 | def test_basic(self): 13 | self.dix = [("B", "P2"), 14 | ("A", "P1")] 15 | pt = PrefixTree(self.dix) 16 | 17 | self.assertEqual(pt.lookup(0,0,"A"),(0,True,"P1")) 18 | 19 | def test_longer(self): 20 | self.dix = [("B", "P2"), 21 | ("ABC", "P1")] 22 | pt = PrefixTree(self.dix) 23 | 24 | self.assertEqual(pt.lookup(0,0,"A"),(0,False,None)) 25 | self.assertEqual(pt.lookup(0,2,"C"),(0,True,"P1")) 26 | -------------------------------------------------------------------------------- /tests/test_wordcut.py: -------------------------------------------------------------------------------- 1 | import unittest 2 | import sys 3 | import os 4 | sys.path.append(os.path.abspath('..')) 5 | from wordcut import Wordcut 6 | 7 | class TestWordcut(unittest.TestCase): 8 | def setUp(self): 9 | self.wordcut = Wordcut.bigthai() 10 | 11 | def test_empty_input(self): 12 | self.assertEqual(self.wordcut.tokenize(""),[]) 13 | 14 | def test_none_input(self): 15 | self.assertEqual(self.wordcut.tokenize(None),[]) 16 | 17 | def test_simple_one(self): 18 | self.assertEqual(self.wordcut.tokenize("ฉันกิน"), 19 | ["ฉัน", "กิน"]) 20 | 21 | def test_single_unk(self): 22 | self.assertEqual(self.wordcut.tokenize("ฬฬฬ"), 23 | ["ฬฬฬ"]) 24 | 25 | def test_simple_roman_without_space(self): 26 | self.assertEqual(self.wordcut.tokenize("ฬฬROฬฬ"), 27 | ["ฬฬ", "RO", "ฬฬ"]) 28 | 29 | def test_simple_space(self): 30 | self.assertEqual(self.wordcut.tokenize("ฬฬ มม"), 31 | ["ฬฬ", " ", "มม"]) 32 | -------------------------------------------------------------------------------- /wordcut/LICENSE: -------------------------------------------------------------------------------- 1 | GNU LESSER GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | 9 | This version of the GNU Lesser General Public License incorporates 10 | the terms and conditions of version 3 of the GNU General Public 11 | License, supplemented by the additional permissions listed below. 12 | 13 | 0. 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See the GNU 526 | Lesser General Public License for more details. 527 | 528 | You should have received a copy of the GNU Lesser General Public 529 | License along with this library; if not, write to the Free Software 530 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 531 | 532 | Also add information on how to contact you by electronic and paper mail. 533 | 534 | You should also get your employer (if you work as a programmer) or 535 | your school, if any, to sign a "copyright disclaimer" for the library, 536 | if necessary. Here is a sample; alter the names: 537 | 538 | Yoyodyne, Inc., hereby disclaims all copyright interest in the 539 | library `Frob' (a library for tweaking knobs) written by James 540 | Random Hacker. 541 | 542 | , 1 April 1990 543 | Ty Coon, President of Vice 544 | 545 | That's all there is to it! 546 | 547 | 548 | -------------------------------------------------------------------------------- /wordcut/__init__.py: -------------------------------------------------------------------------------- 1 | """wordcutpy is a word tokenizer written in Python.""" 2 | 3 | import re 4 | 5 | 6 | class PrefixTree: 7 | """PrefixTree is a hash tree for storing and searching word list.""" 8 | 9 | def __init__(self, members_with_payload): 10 | """Prefix tree is constructed from sorted members with payload.""" 11 | self.tab = {} 12 | if members_with_payload is None: 13 | return None 14 | sorted_members_with_payload = sorted(members_with_payload, 15 | key=lambda i: i[0]) 16 | 17 | for i in range(len(sorted_members_with_payload)): 18 | members, payload = sorted_members_with_payload[i] 19 | row_no = 0 20 | for j in range(len(members)): 21 | is_terminal = len(members) == j + 1 22 | member = members[j] 23 | key = (row_no, j, member) 24 | if key in self.tab: 25 | row_no = self.tab[key][0] 26 | else: 27 | val = (i, is_terminal, payload if is_terminal else None) 28 | self.tab[key] = val 29 | row_no = i 30 | 31 | def lookup(self, i, offset, member): 32 | """Lookup is done by searching an element of members in the tree.""" 33 | key = (i, offset, member) 34 | if key not in self.tab: 35 | return None 36 | return self.tab[key] 37 | 38 | 39 | UNK = 1 40 | DICT = 2 41 | INIT = 3 42 | LATIN = 4 43 | PUNC = 5 44 | 45 | 46 | def is_better(link0, link1): 47 | """Links are compared by their properies.""" 48 | if link0 is None: 49 | return True 50 | 51 | if link1["unk"] < link0["unk"]: 52 | return True 53 | 54 | if link1["w"] < link0["w"]: 55 | return True 56 | 57 | return False 58 | 59 | 60 | class LatinTransducer: 61 | """Latin transducer detects latin tokens.""" 62 | 63 | def __init__(self): 64 | """Latin transducer is constructed by letting pointers to be None.""" 65 | self.latin_s = None 66 | self.latin_e = None 67 | 68 | def update(self, ch, i, s): 69 | """Update by feeding a character, its position, and the string.""" 70 | if self.latin_s is None: 71 | if re.match("[A-Za-z]", ch): 72 | self.latin_s = i 73 | else: 74 | if re.match("[A-Za-z]", ch): 75 | if i + 1 == len(s) or not re.match("[A-Za-z]", s[i + 1]): 76 | self.latin_e = i + 1 77 | else: 78 | self.latin_s = None 79 | self.latin_e = None 80 | 81 | def create_link(self, path): 82 | """Pointers are used for creating a link.""" 83 | if self.latin_s is not None and self.latin_e is not None: 84 | p_link = path[self.latin_s] 85 | _link = {"p": self.latin_s, 86 | "w": p_link["w"] + 1, 87 | "unk": p_link["unk"], 88 | "type": LATIN} 89 | return _link 90 | return None 91 | 92 | 93 | class PuncTransducer: 94 | """Punc Transducer detects puncuation tokens.""" 95 | 96 | def __init__(self): 97 | """Punc Transducer is constructed by letting pointers to be None.""" 98 | self.punc_s = None 99 | self.punc_e = None 100 | 101 | def update(self, ch, i, s): 102 | """Update by feeding a character, its position, and the string.""" 103 | if self.punc_s is None: 104 | if ch == " ": 105 | self.punc_s = i 106 | else: 107 | if ch == " ": 108 | if len(s) == i + 1 or s[i + 1] != " ": 109 | self.punc_e = i + 1 110 | else: 111 | self.punc_s = None 112 | self.punc_e = None 113 | 114 | def create_link(self, path): 115 | """Pointers are used for creating a link.""" 116 | if self.punc_s is not None and self.punc_e is not None: 117 | p_link = path[self.punc_s] 118 | _link = {"p": self.punc_s, 119 | "w": p_link["w"] + 1, 120 | "unk": p_link["unk"], 121 | "type": PUNC} 122 | return _link 123 | return None 124 | 125 | 126 | def build_path(dix, s): 127 | """Build path constructs word tokenization path.""" 128 | left_boundary = 0 129 | dict_acc_list = [] 130 | 131 | path = [{"p": None, "w": 0, "unk": 0, "type": INIT}] 132 | 133 | punc_transducer = PuncTransducer() 134 | latin_transducer = LatinTransducer() 135 | 136 | for i, ch in enumerate(s): 137 | dict_acc_list.append({"s": i, "p": 0, "final": False}) 138 | 139 | # Update dict acceptors 140 | _dict_acc_list = dict_acc_list 141 | dict_acc_list = [] 142 | for acc in _dict_acc_list: 143 | offset = i - acc["s"] 144 | child = dix.lookup(acc["p"], offset, ch) 145 | if child is not None: 146 | child_p, is_final, payload = child 147 | dict_acc_list.append({"s": acc["s"], "p": child_p, 148 | "final": is_final}) 149 | latin_transducer.update(ch, i, s) 150 | punc_transducer.update(ch, i, s) 151 | 152 | # select link 153 | link = None 154 | 155 | # links from wordlist 156 | for acc in dict_acc_list: 157 | if acc["final"]: 158 | p_link = path[acc["s"]] 159 | _link = {"p": acc["s"], 160 | "w": p_link["w"] + 1, 161 | "unk": p_link["unk"], 162 | "type": DICT} 163 | if is_better(link, _link): 164 | link = _link 165 | 166 | _link = latin_transducer.create_link(path) 167 | if _link is not None and is_better(link, _link): 168 | link = _link 169 | 170 | _link = punc_transducer.create_link(path) 171 | if _link is not None and is_better(link, _link): 172 | link = _link 173 | 174 | # fallback 175 | if link is None: 176 | p_link = path[left_boundary] 177 | link = {"p": left_boundary, 178 | "w": p_link["w"] + 1, 179 | "unk": p_link["unk"] + 1, 180 | "type": UNK} 181 | 182 | path.append(link) 183 | 184 | if link["type"] != UNK: 185 | if link["type"] == LATIN or link["type"] == PUNC: 186 | left_boundary = i + 1 187 | else: 188 | left_boundary = i 189 | 190 | return path 191 | 192 | 193 | def path_to_tokens(txt, path): 194 | """Path to Token transforms a path to a list of tokens.""" 195 | if len(path) < 2: 196 | return None 197 | 198 | e = len(path) - 1 199 | toks = [] 200 | 201 | while True: 202 | link = path[e] 203 | s = link["p"] 204 | if s is None: 205 | break 206 | toks.append(txt[s:e]) 207 | e = s 208 | 209 | toks.reverse() 210 | return toks 211 | 212 | 213 | def tokenize(dix, txt): 214 | """Tokenize splits a string to a list of tokens.""" 215 | if txt is None or txt == "": 216 | return [] 217 | path = build_path(dix, txt) 218 | return path_to_tokens(txt, path) 219 | 220 | 221 | class Wordcut: 222 | """Wordcut wraps functions and data related tokenizaion.""" 223 | 224 | def __init__(self, wordlist): 225 | """Wordcut is constructed by a sorted list of words.""" 226 | self.dix = PrefixTree([(word, None) for word in wordlist]) 227 | 228 | @classmethod 229 | def bigthai(cls): 230 | """Bigthai constructs Wordcut based on a big Thai word list.""" 231 | import os 232 | "Initialize from bigthai" 233 | fileDir = os.path.dirname(__file__) 234 | filename = os.path.join(fileDir, 'bigthai.txt') 235 | with open(filename, 'r', encoding='utf-8-sig') as dict_file: 236 | word_list = list(set([w.rstrip() for w in dict_file.readlines()])) 237 | word_list.sort() 238 | return cls(word_list) 239 | 240 | def tokenize(self, s): 241 | """Tokenize splits a string to a list of tokens.""" 242 | return tokenize(self.dix, s) 243 | -------------------------------------------------------------------------------- /wordcut/dict.txt: -------------------------------------------------------------------------------- 1 | กา 2 | ขา 3 | หมา -------------------------------------------------------------------------------- /wordcut/example.py: -------------------------------------------------------------------------------- 1 | #! -*- coding: UTF8 -*- 2 | from wordcut import Wordcut 3 | if __name__ == '__main__': 4 | with open('bigthai.txt') as dict_file: 5 | word_list = list(set([w.rstrip() for w in dict_file.readlines()])) 6 | word_list.sort() 7 | wordcut = Wordcut(word_list) 8 | print(wordcut.tokenize("กากา cat หมา")) 9 | --------------------------------------------------------------------------------